APRILIA ATLANTIC 500, Workshop Manual

Page: 93 / 170

Electrical system
chap. 6
6-14
Release 00 2002-09
Atlantic 500
CHECKING THE FUEL INJECTOR
With the engine off:
• Disconnect the two-way connector (black) (1) and
carry out the relevant measurements (on the
injector-side terminals).
• Use a tester (scale x 100
Ω
) to measure the
resistance between the fuel injector-side termi-
nals.
Standard value: 14.5
±
10%
Ω Ω
Ω Ω
Ω
at 45
°
F (25
°
C)
If resistance is infinite (
∞
) or lower than the pre-
scribed value, the injector (2) must be replaced.
CHECKING THE CONDITION OF THE COOLANT
THERMISTOR
• Remove the thermistor (1), see (REMOVING THE
COOLANT THERMISTOR).
• Connect a tester (2) (set as an ohmmeter) to the
thermistor (1), as shown in the figure.
• Immerse the thermistor (1) in a container (3) filled
with coolant.
• Immerse a thermometer (4) with a range of 32-
302
°
F (0-150
°
C) in the same container.
• Place the container on a burner (5) and heat the
coolant slowly.
• Check the temperature shown by the thermometer
(4) and the value of the thermistor (1), as shown
on the tester.
Make sure that the value varies according to tempera-
ture, as indicated.
NOTE
If, as the temperature changes, the standard
values do not change or are greatly different from the
values shown in the table, replace the thermistor (1).
• Repeat these operations for the other thermistor.
Temperature
°
F (
°
C)
A1 - A2 (
Ω
)
B1 - B2 (
Ω
)
140 (60) 557
±
10% 576
±
10%
194 (90) 196
±
10% 231
±
10%
248 (120) 80.6
±
10% 105
±
10%
A1
B2
B1
A2
1
1
2